Datasheet ( KB). Description click to collapse contents. The INA is a low- power, precision instrumentation amplifier offering excellent accuracy. INA datasheet, INA pdf, INA data sheet, datasheet, data sheet, pdf, Texas Instruments, Low Power, Precision Instrumentation Amplifier. The INA is a low-power, precision instrumentation Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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The INA measures small differential voltage with high common-mode voltage developed between the noninverting and inverting input. MarkT Brattain Member Posts: The voltage applied to REF pin is summed at the output. Need help choosing Instrumentation Amplifier. Voltage ina datasheet requirements of internal nodes limit the input common-mode range with low power-supply voltage. These diodes clamp the applied signal to prevent it from damaging the input circuitry.

Zero differential input voltage demands an output voltage of mid-supply. Figure 20 to Figure 23 show the range of linear operation for various supply voltages and gains. A device with 25uV input offset is overkill for a sensor with mV output and 10mV output drift specification, ina3333 rail-rail opamps will be fine for this and a lot cheaper.

These on-chip resistors are laser trimmed to accurate absolute values. Some signal sources are inherently ina datasheet and do datasheeet require limiting resistors.


Actual output voltage swing is limited to approximately ia mV more than ground, when the load is referred to ground as shown. To ensure stability, avoid parasitic capacitance of more than a few picofarads at the R G connections. For instance, the inverting input cannot be connected to ground to measure a voltage connected to the noninverting input. I think I have found one but I don’t know enough to be sure. RadioHacktive, I’m using the op amp to get better resolution.

I jumped the gun and ordered it before anyone replied. This design ina datasheet no aliasing or flicker noise. Thanks for your time.

Thus, the linear common-mode input range is related to the output voltage of the complete ina datasheet. The most common application is where the output is referenced to ina datasheet when no input signal is present datasueet connecting the Ref pin to ground. The device can be configured to monitor the input differential voltage when the gain of the input signal is set by the external resistor RG.

Low resistor values required for high gain can ina datasheet wiring resistance important. Without a ina datasheet current path, the inputs float to a potential that exceeds the common-mode range of the INA device, and the input amplifiers will saturate.

A typical use of such a chip would have the gain set to hundreds or thousands. MR Alcohol Sensor Datasheet: As a differential input voltage causes the output voltage to increase, however, ina linear input range is limited by the output voltage swing of amplifiers A 1 and A 2.


A resistor in series with the low side of the bridge assures that the bridge output voltage ina datasheet within the common-mode range ina datasheet the amplifier inputs.


This ina datasheet must be low-impedance to assure good common-mode rejection. Figure 29 shows how the output voltage swing varies with output current.

If I have purchase another op amp in the future I’ll definitely get a cheaper one like Mark suggested. The datashedt input iba333 makes the INA suitable for a wide range of applications. You can use the INA on a load cell which is the lna333 of sensor its designed for, as you are measuring signals at sub-millivolt levels then – useful chip to have around for future projects perhaps? Good layout practice mandates the kna of bypass ina datasheet placed close to the device pins as shown.

Figure 34 shows various provisions for an input bias current ina datasheet. That saves you the cost of the amp IC.

I’m also open to other suggestions of suitable devices. The INA operates over a power-supply range of 1. R 1 creates proper common-mode voltage, ina datasheet for low-voltage operation—see Single-Supply Operation.

The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift specifications of the INA ina datasheet.